A winter storm affected the Poconos from the evening of the 20th into the evening of the 21st and a wintry mix of snow and freezing rain affected the rest of Eastern Pennsylvania from the evening of the 20th into the morning of the 21st. Snowfall accumulations averaged 4 to 8 inches from the Lehigh Valley northward with the highest amounts in the Poconos. Accumulations averaged 1 to 4 inches across the Philadelphia Metropolitan area and Berks County. Ice accretions throughout the region averaged less than one tenth of an inch. Because this event occurred on a holiday weekend with schools and most businesses closed on the 21st, the number of reported accidents was lighter than usual. Precipitation started as snow during the evening of the 20th across Eastern Pennsylvania. As warmer air moved in aloft, the snow changed to freezing rain between 2 a.m. and 5 a.m. EST on the 21st except in the Poconos where the changeover occurred between 5 a.m. and 8 a.m. EST on the 21st. Precipitation ended as plain rain around the local Philadelphia area, but ended as freezing rain elsewhere between 5 a.m. and 9 a.m. EST on the 21st. The only exception was in the Poconos where light freezing drizzle and or freezing rain persisted into the evening.  In Berks County, a 50-year-old male passenger died when the vehicle he was in went off the snow covered eastbound Interstate 78 in Greenwich Township and struck a parked tractor-trailer. Another serious injury occurred to a 28-year-old man on the same interstate near Hamburg when his pickup truck slid sideways into a tractor-trailer. In Northampton County, Pennsylvania State Route 33 was closed for about an hour after a woman was seriously injured after her vehicle spun into a tractor-trailer. In Lower Saucon Township, a man was seriously injured after he rear-ended a tractor-trailer on Interstate 78. Specific accumulations included 7.5 inches in Lehighton (Carbon County) and Saylorsburg (Monroe County), 6.3 inches in East Stroudsburg (Monroe County), 6.0 inches in Albrightsville (Carbon County) and Pocono Summit (Monroe County), 5.5 inches in Springtown (Bucks County) and Germansville (Lehigh County), 4.8 inches at the Lehigh Valley International Airport, 4.3 inches in Doylestown (Bucks County), 3.5 inches in Reading (Berks County), 3.1 inches in Downingtown (Chester County), 3.0 inches in Neshaminy Falls (Bucks County), 2.8 inches in Douglassville (Berks County) and Rosemont (Delaware County), 2.0 inches in Honey Brook (Chester County), 1.5 inches in West Chester (Chester County) and at the Franklin Institute within Philadelphia and 1.0 inch in Chadds Ford and Rosemont (Delaware County).The wintry weather was caused by a low pressure system that formed to the lee of the central Rockies on the 19th. It moved into eastern Iowa during the afternoon of the 20th, central Illinois during the evening of the 20th, Lake Erie shortly after midnight EST on the 21st and Lake Ontario around sunrise on the 21st. Precipitation occurred on the cold side of this low pressure systems warm front. As warmer air moved in aloft, precipitation changed to freezing rain in many places before it ended. The only exception was in the Poconos where light freezing rain or freezing drizzle persisted into the evening as a secondary low formed on the warm front east of New Jersey and trapped low level cold air in place in those areas.

Winter Weather in DELAWARE, PENNSYLVANIA
From 20-FEB-05 19:00:00 to 21-FEB-05 05:00:00 (EST)
Reported by: TRAINED SPOTTER

Winter Weather in LEHIGH, PENNSYLVANIA
From 20-FEB-05 18:00:00 to 21-FEB-05 09:00:00 (EST)
Reported by: TRAINED SPOTTER

Winter Weather in MONTGOMERY, PENNSYLVANIA
From 20-FEB-05 19:00:00 to 21-FEB-05 07:00:00 (EST)
Reported by: TRAINED SPOTTER

Winter Weather in NORTHAMPTON, PENNSYLVANIA
From 20-FEB-05 18:00:00 to 21-FEB-05 09:00:00 (EST)
Reported by: TRAINED SPOTTER

Winter Weather in PHILADELPHIA, PENNSYLVANIA
From 20-FEB-05 19:00:00 to 21-FEB-05 05:00:00 (EST)
Reported by: TRAINED SPOTTER

Winter Storm in CARBON, PENNSYLVANIA
From 20-FEB-05 18:00:00 to 21-FEB-05 22:00:00 (EST)
Reported by: TRAINED SPOTTER

Winter Storm in MONROE, PENNSYLVANIA
From 20-FEB-05 18:00:00 to 21-FEB-05 22:00:00 (EST)
Reported by: TRAINED SPOTTER

Winter Weather in BERKS, PENNSYLVANIA
From 20-FEB-05 19:00:00 to 21-FEB-05 05:00:00 (EST)
Reported by: TRAINED SPOTTER

Winter Weather in BUCKS, PENNSYLVANIA
From 20-FEB-05 20:00:00 to 21-FEB-05 08:00:00 (EST)
Reported by: TRAINED SPOTTER

Winter Weather in CHESTER, PENNSYLVANIA
From 20-FEB-05 18:00:00 to 21-FEB-05 07:00:00 (EST)
Reported by: TRAINED SPOTTER